<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
    <style>
        fieldset{
            width: 600px;
            height: 100px;
            border: 1px dashed red;
        }
        legend{
            width: 100px;
            text-align: center;
            margin-left: -110px;
        }
        
    </style>
</head>
<body>
    <!-- ieldset相当于一个框 可以嵌套，内部可以设置多个fieldest对象 -->
    <fieldset>
        <!-- legeng字段级标题 -->
        <legend>qqqqaw</legend>
        <form action="">
            <!-- multiple 选择多个文件 -->
            <input type="file" multiple>
        </form>
    </fieldset>
</body>
</html>